This task begins with Sir Delvas in Shard's Landing (in the northwestern part of the crater: 880, 75, 1).

You say, 'Hail, Sir Delvas'

Sir Delvas says 'Greetings to you, _____. I am Delvas of Erollisi. I have come to serve as portal tender for the Harbingers so that adventurers like you could seek safe passage to the Fallen Chapterhouse. Despite their initial impressions the congregation here is quite respectable. Though I do not subscribe to their doctrine I nonetheless respect their dedication to their deity. If you seek fast travel to the Chapterhouse you will first need to [attune] yourself to this portal, an unfortunate necessity of the teleportation magic imbued in the portals the Harbingers have constructed.'